[PATCH 4/4] debug-pagealloc: use memchr_inv

[Akinobu Mita <akinobu.mita@gmail.com>]

Use newly introduced memchr_inv for page verification.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 mm/debug-pagealloc.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
index 5afe80c..d8470d4 100644
--- a/mm/debug-pagealloc.c
+++ b/mm/debug-pagealloc.c
@@ -1,4 +1,5 @@
 #include <linux/kernel.h>
+#include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/page-debug-flags.h>
@@ -62,11 +63,8 @@ static void check_poison_mem(unsigned char *mem, size_t bytes)
 	unsigned char *start;
 	unsigned char *end;
 
-	for (start = mem; start < mem + bytes; start++) {
-		if (*start != PAGE_POISON)
-			break;
-	}
-	if (start == mem + bytes)
+	start = memchr_inv(mem, PAGE_POISON, bytes);
+	if (!start)
 		return;
 
 	for (end = mem + bytes - 1; end > start; end--) {
-- 
1.7.4.4

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